Aegis Group continued its series of digital acquisitions with the purchase of small ad server [Providence-based] Bluestreak.

The buy brings Aegis its own ad-serving technology, which will allow its agencies to serve, manage and analyze the performance of display advertising. Aegis plans to integrate the ad-serving capability into its digital network Isobar, which includes Carat Fusion, to track and manage ads across both search and display media.

Aegis has made several digital acquisitions to build out Isobar in emerging areas. Earlier this month, it finalized a deal to buy mobile marketing agency Marvellous Mobile. It also acquired word-of-mouth shop Ammo Marketing in February 2006, [Watertown, Mass.-based] Web design firm Molecular in April 2005 and search firm iProspect [(also Watertown, Mass.-based)] in December 2004.